Infraorder Brachyura

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Scientific names for Aves taxonomy (family and below) are from The Howard and Moore Complete Checklist of the Birds of the World, Princeton University Press, copyright 2003. Used by permission.

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  Kingdom Animalia (animals)
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  Eumetazoa (metazoans)
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  Bilateria (bilaterally symmetrical animals)
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  Protostomia (protostomes)
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  Ecdysozoa
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  Phylum Arthropoda (crustaceans, insects, spiders, and relatives)
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  Subphylum Crustacea (crustaceans)
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  Class Malacostraca (crabs, krill, pill bugs, shrimp, and relatives)
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  Subclass Eumalacostraca
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  Superorder Eucarida
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  Order Decapoda (crabs, shrimp, and relatives)
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  Suborder Pleocyemata
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  Infraorder Brachyura
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  Superfamily Cancroidea
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  Family Atelecyclidae (horse crabs)
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  Family Cancridae (rock crabs)
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  Family Corystidae
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  Family Pirimelidae
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  Family Thiidae
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  Superfamily Cryptochiroidea
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  Family Cryptochiridae (gall crabs)
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  Family Cyclodorippidae
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  Superfamily Cyclodorippoidea
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  Family Cymonomidae
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  Superfamily Dorippoidea
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  Family Dorippidae (sumo crabs)
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  Superfamily Dromioidea
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  Family Dromiidae (sponge crabs)
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  Family Dynomenidae
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  Family Homolodromiidae
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  Family Eumedonidae
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  Superfamily Grapsoidea
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  Family Gecarcinidae (land crabs)
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  Family Grapsidae (marsh crabs, shore crabs, and talon crabs)
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  Superfamily Homoloidea
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  Family Homolidae (carrier crabs)
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  Family Latreilliidae
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  Family Hymenosomidae
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  Superfamily Leucosioidea
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  Family Calappidae (box crabs)
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  Family Leucosiidae (purse crabs)
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  Superfamily Majoidea
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  Family Majidae (spider crabs)
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  Family Mimilambridae
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  Superfamily Ocypodoidea
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  Family Ocypodidae (fiddler crabs and ghost crabs)
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  Family Palicidae (stilt crabs)
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  Family Retroplumidae
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  Superfamily Parthenopoidea
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  Family Parthenopidae (elbow crabs)
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  Superfamily Pinnotheroidea
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  Family Pinnotheridae (pea crabs)
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  Superfamily Portunoidea
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  Family Geryonidae (deepsea crabs)
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  Family Portunidae (swimming crabs)
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  Family Potamidae
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  Superfamily Raninoidea
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  Family Raninidae (frog crabs)
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  Family Sinopotamidae
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  Family Trapeziidae
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  Superfamily Xanthoidea
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  Family Goneplacidae
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  Family Xanthidae (mud crabs)